Systems and methods for indicating the presence of a child in a vehicle

ABSTRACT

Systems and methods which provide for an alarm or notification that a child is in a car seat. The systems generally determine if a child is in the seat and that the seat, and therefore the vehicle, is not in motion. Upon detecting both situations, the notification or alarm is activated.

CROSS REFERENCE TO RELATED APPLICATION(S)

This application claims the benefit of U.S. Provisional Application No.61/013,929 filed Dec. 14, 2007, the entire disclosure of which is hereinincorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This disclosure relates to the field of safety devices for detection ofunattended children within a vehicle.

2. Description of Related Art

Every summer there are stories on the news of children beinginadvertently left in vehicles by a parent or guardian. Many of thesestories have a relatively happy ending as the child is noticed by apasserby, rescued from the vehicle before suffering any adverseconsequences, and the grateful parent discusses how thankful they arefor others being observant. The more tragic stories result in theavoidable death of a child and generally the devastation of a family.

One thing that these stories often bring to a forefront of discussion iswhether the potential danger present from a parent leaving a child inthe vehicle should result in criminal charges being brought against theparent for endangering the child. As part of this, there is alwayssignificant hand-wringing over how a parent could possibly be soforgetful. Talking to many parents that have not yet left a child in avehicle, the thought of it being accidental is simply unbelievable. Yet,when you talk to a parent that has inadvertently left a child in avehicle (with whatever consequences) you quickly discover that up untilthey actually did it, they had a similar opinion.

The simple fact of life in today's world is that it is hectic and manypeople only get through the day operating purely on habit and routine.There is probably no greater routine breaking event than the birth of achild. Such an event will greatly change the lives of the parents in amyriad of different ways and for anybody who is forced to live a hecticschedule it is easy to see how a parent, simply acting as they didbefore they had the child, can inadvertently forget that the child is inthe back of the vehicle at this particular time. This problem iscompounded by the fact that both parents generally share childtransportation duties in today's world, and often do so along arelatively random schedule. Therefore, on any given day at any giventime either parent may or may not be transporting a child.

Still further, the very features designed to make automobiles safer tooperate and to keep children safe in them contribute to the problem.With the addition of airbags and safer car seats, children are nowgenerally placed in the back seat of the vehicle, instead of in thefront seat where they were more easily seen by a parent departing thevehicle, particularly if the child is asleep or quiet. Further, withrear facing car seats it can often be difficult to see if the seat isoccupied. This all makes it easier for a frazzled parent to forget thechild is there. As the old adage goes, “out of sight, out of mind.”

While new parents may not be used to thinking about having a child inthe vehicle at all, parents of older children can often forget if thechild is in the vehicle because the child's car seat or otherindications of the child become near permanent fixtures in theirvehicle, whether or not the child is present, and routines may not begreatly altered by the presence of the child, Therefore, a change inroutine such as when the child is being dropped off at daycare, whichparent has the child today, or even a non-standard trip where the childis brought along can result in the child being inadvertently leftunattended in the vehicle.

Beyond the child being inadvertently left in the vehicle by a parent,children are also inquisitive and an older child may get into a parkedvehicle without a parent knowing. This situation can be just asdangerous as leaving an unattended child in the vehicle, but may be muchharder for a parent to detect since the parent was not involved in thechild getting into the vehicle originally.

SUMMARY OF THE INVENTION

For these and other reasons there are described herein systems andmethods which are designed to provide an alarm or other reminder that achild is likely present in a parked vehicle. These can range from subtleaudio reminders designed to remind a parent as they are parking avehicle that the child is present, to blaring audio and visual remindersto try and trigger the attention of passers-by, to systems designed todetect that a child has gotten into an unattended vehicle on its own.

There is described herein, among other things, a device for providingnotice that a child is in a car seat comprising: a pressure sensor; anaccelerometer, a notification system; and a controller; wherein if thepressure sensor detects pressure and the accelerometer does not detectmovement, the controller activates the notification system.

In an embodiment the device further comprises a temporary disarmingswitch.

In another embodiment of the device, the pressure sensor is placed in achild seat, such as, but not limited to, a forward facing care seat, arearward facing car seat, or a booster seat.

In an embodiment of the device the notification system plays sound, suchas but not limited to children's songs, when activated. The notificationsystem may also be activated when the pressure sensor goes fromdetecting pressure to not detecting pressure, either with the same or adifferent notification.

In another embodiment of the device there is a delay, such as about 15seconds, after the accelerometer does not detect movement before thenotification system is activated.

In another embodiment of the device once the notification system isactivated, it waits a preselected amount of time and then activatesagain. This may provide the same notification, or a differentnotification, such as to provide an escalating alarm where the laternotification is more disruptive than the first.

There is also described herein, a device for providing notice that achild is in a car seat comprising: means for detecting that a child isin a car seat; means for detecting that a the car seat is in motion; andmeans for notifying which provides notice if the means for detecting thechild indicates the child is in the car seat and the means for detectingthat the car seat is in motion indicates that it is not.

In embodiments of the device the child seat may be forward facing,rearward facing or a booster seat.

In another embodiment of the device, the means for detecting detectsacceleration.

In another embodiment of the device the means for notifying plays a songwhen it provides notice.

There is also described herein, a method for assisting in the detectionof a child in a parked motor vehicle, the method comprising: detectingwhether or not a child is in a vehicle; detecting whether or not thevehicle is not in motion; and if the child is in the vehicle and thevehicle is not in motion, generating a notification signal to indicatethe presence of the child.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top down view of an embodiment of a notification system.

FIG. 2 illustrates a child's vehicle safety seat including an embodimentof a notification system which is in place.

FIG. 3 illustrates a child's vehicle safety seat with the cushion raisedto show positioning of the pressure sensitive pad.

FIG. 4 is a circuit diagram showing an embodiment of a circuit boardlaying on an embodiment of a notification system.

FIG. 5 is a functional electronic diagram of various of the processorsand components from an embodiment of electronics.

FIG. 6 provides a top down view of another embodiment of a notificationsystem.

DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

Generally the notification systems (200) and methods discussed hereininclude four major components which may be arranged in a variety ofconfigurations. Firstly, there is an alarm or reminder (211) whichserves as the indicator to determine if an unattended child (101) ispresent or to act as a reminder that a child (101) may be present andneeds to be attended to. The systems and methods also generally includea child detector (201), which serves to determine if there is anincreased likelihood of a child (101) being present in a car seat (100)or in the vehicle and therefore it is appropriate to trigger the alarm(211) should the vehicle be parked. The systems and methods also includea detection apparatus (221) whose purpose is to determine if the vehicleis in operation. Generally, these systems (221) are used to determine ifthe vehicle is in motion. Finally, the system (200) and methods willgenerally include a processor (231) or similar control apparatus whichserves to coordinate and control the various other components andoperate the system.

A major problem with prior child detection systems is that they requirethe vehicle operator to manually arm them or make sure they are switchedon when they begin use of the vehicle because otherwise the systems(200) could indicate alerts when the vehicle was simply driving down theroad or could be constantly triggering even if the child (101) was notin a car seat (100). The problem with any such system is that it is justas easy to forget to arm the system when the child (101) is using theseat (100), as it is to leave the unattended child (101) in the vehicle.For this reason, a system (200) to act as an alert or reminder should bearmed by placement of the child (101) in the car seat (100) and/or byplacement of the seat (100) in a vehicle. In this way, when the child(101) is in the vehicle the system (200) is automatically armed.

As shown if FIG. 2, systems and methods discussed herein are generallydesigned to operate in conjunction with the use of a child seat (100) inconjunction with a vehicle. This child seat (100) may be of any type,and for any aged child (101) and may be forward facing, rearward facing,convertible, or a booster seat. The device may be used on car seats(100) which are designed to be left in the vehicle with the child (101)getting out of the seat (100) to leave the vehicle, may be used on carseats (100) which are removed with the child (101) when the child (101)leaves the vehicle, or may be used on car seats (100) which utilize acar adapter where a portion of the car seat (100) is removed with thechild (101), but a connector or similar structure is designed to remainin the vehicle.

While it will generally be the case that the device (200) will be usedwith a child car seat (100), it is by no means required and the systemsand devices (200) can operate without need of such a car seat (100) asdiscussed herein. However, children who are generally old enough to notneed any form of car seat (100), are also generally old enough to callfor help and/or to extract themselves from the vehicle should they beleft. Children (101) in safety seats (100) are much more dependent ontheir parents as they are less likely to speak out or indicate that theyare about to be forgotten, they are often asleep, and they generallycannot reach or operate the car doors to exit the vehicle themselves.Even if they can, they may not be aware that remaining alone in thevehicle is dangerous.

A first embodiment of a notification device is shown in FIG. 1. Thisdevice (200) is generally preferred for use in a forward facing toddlertype seat (100) or a booster seat such as for an older child. With sucha seat (100) the seat (100) will remain in the vehicle when the child(101) leaves the vehicle and therefore the device (200) will also remainin the vehicle For this reason, the device's arming system willgenerally not be able to be manually disabled as possible annoyance fromit going off when the seat (100) is in a public place or where it maydistract others is very unlikely since the seat (100) is left in thevehicle.

The embodiment of FIG. 6 provides for an alternative embodiment to thatof FIG. 1 which allows for a manual and temporary disarming of thedevice (500). However, other than this additional feature, the twodevices (200) and (500) generally operate in a similar fashion andsimilar components of their operation will be discussed together.

As shown in FIGS. 1 and 2, in this embodiment there is provided a carsafety seat (100) into which the child (101) will be placed andappropriately secured. The seat (100) includes a notification system(200) or (500) which is designed to trigger a notification should thechild (101) be in the seat (100) and the vehicle be parked. Thenotification system generally comprises two parts which are connectedtogether. First is a device for detecting (201) the child (101) if achild (101) is in the seat (100). There is also a master housing (205)which includes other electronics. The housing (203) and detector (201)are connected by a wire (207) or other communication system. The masterhousing (203) will generally include a detector (221) for determining ifthe vehicle is in operation. In a preferred embodiment the detector(221) comprises a motion detector such as an accelerometer which willtemporarily disable the notification (211) if the seat (101) iscurrently in motion and a processor (231) and associated controlelectronics for operating the system (200), as well as alarm and/ornotification apparatus (211), Contents of the master housing (203) aredescribed in more detail in conjunction with FIGS. 4 and 5.

As shown in FIG. 3, the detector (201) is designed to be placed in theseat (100) so as to detect the presence of the child (101). In theembodiment of FIG. 3, the detector (201) is a pressure sensor andtherefore is placed under the padding of the seat where the child (101)will likely be reclined or sitting. In this way, the weight of the child(101) will activate the pressure sensor (201) to indicate that the child(101) is present in the seat (100).

The system and methods are generally designed to provide for twodifferent situations effectively following a logical chain of operationIf the seat (100) is likely occupied by a child (101) and the vehicle isnot currently in motion, the systems and methods are designed toinitiate a notification sequence which will result in an alarmsituation. Otherwise, the system (200) will generally sleep and nottrigger an alarm. In this way the alarm will not be triggered if either,the car seat (100) is unoccupied, or the vehicle is in operation andtherefore the parent is likely present and also in the vehicle.

As shown in FIG. 3, the seat (106) generally includes a sensor (201) todetect whether the seat (100) is occupied by a child and therefore ifthe system (200) should be armed. In a preferred embodiment of thesystem (200), the system (200) is generally never “off.” Instead, thesystem (200) is always armed and either is indicating notification orthe notification is temporarily disabled. However, in an alternativeembodiment the system (200) can be turned off for long term storage ordisuse. Generally, however, such ability to turn the system (200) offwill not be simple and may involve removing a battery (203) or otherwisedisconnecting a power source so that it is not done casually or simply.

In one embodiment, the device (200) may include a temporary disarmbutton (209) which is used so that the device need not be turned offwhen the seat is removed from the vehicle This embodiment is depicted inFIG. 6. The temporary disarm (209) may be placed in the master housing(203), or along the wire (207) as shown, and serves to provide for atemporary ability to silence the alarm. This will generally be for alimited amount of time such as fifteen minutes or less. Generally, thedisarm (209) will allow the user to indicate a time for disabling thealarm, or to immediately silence the alarm for a period of time. In astill further embodiment, the disarm (209) may be designed to allow theuser to add a multiple number of disarms by pushing the buttonrepeatedly, or by entering a specific disarm time to provide for alonger disarm.

The temporary disarm (209) is to allow for the device (200) to be activewhen the child (101) is in the seat (100) but the seat (100) is not inthe vehicle or otherwise being used in a fashion that serves to disablethe notification as discussed below. For this reason, the disarm buttonwill generally be used in car seats which are designed for infants(rearward facing) and where the child (101) is removed with at least aportion of the seat (104) in standard operation since it would only bein this situation where such a disarm would be desirable.

This temporary disarm (201) is provided so that the child (101) mayremain in the seat (100) with the seat (400) being placed on astationary surface without the alarm being triggered. In this way, thesystem (200) is not distracting or annoying because it providesnotification when the seat (100) is not in a vehicle. For example, ifthe system was used in conjunction with driving, the user then arrivedat their location and knew that the child (101) was going to remain inthe seat (100) but the system (200) may be triggered (for example if theuser was in church or at a movie), the user could disarm (209) thesystem (200) for the amount of time that they would be out of thevehicle, it would then automatically rearm after that time.

In a still further embodiment, the system could include a rearm switchso that if the time spent outside the vehicle was less than wasexpected, the user could indefinitely rearm the system (200) instead ofhaving to wait out the temporary disarm to time out. In an embodiment,this rearm could occur automatically by the system detecting the child(101) being removed from the seat (100).

In the depicted embodiment of FIG. 1, the system (200) is always on andactively determining the situation. This can be a more useful embodimentwhen the child (101) is not expected to be in the seat (100) unless theyare in the vehicle. In this system the notification (211) is disabledonly if the child sensor (201) determines that the seat (100) isunoccupied and therefore there is no need to notify the occupants in thevehicle that there is a child (101) in the seat (100). In the disabledcondition, the notification (211) will not generally sound.

The method for determining occupancy can take a variety of forms. In theembodiment of FIGS. 1 and 6, the system for determining occupancycomprises a weight sensitive pad (201). This pad (201) will detect themass of a child (101) being rested in the seat (100), The existence ofsuch weight (which may be as little as 1 or 2 pounds) in the seat (100)triggers the system (200) to indicate that the seat (100) is occupiedand arms the system (200).

In alternative embodiments, other child sensing systems (201) may beused. For instance, a child's body heat, or volume, instead of mass,could be detected. Such a sensor could detect that there is a warmobject placed in the car seat (100), or could detect that an objecthaving a particular volume is present. For instance, sufficient to breakan invisible “line” between a transmitter and detector on opposing sidesof the seat (100). Such sensors may be optical (e.g. an infra redemitter detector pair) acoustic, piezo-electric, force sensitive,capacitive, infra-red, mechanical, or of any other type known to one ofordinary skill in the art.

In one such alternative a motion detector system can be used as thechild detector (201). This will generally determine if there is motionin the general area of the seat (100), for instance, as viewed from theback of a front seat. This can be the most optimal detection system forlarger children where they may be on a booster seat or more open seatwhere they can move and possibly move off of a different type of sensorand are less likely to have fallen asleep. In an embodiment, an infrared sensor can be used, although other sensors can be used such as, butnot limited to, acoustic, radar capacitive or one could tie into one ofthe vehicle's existing sensors, transmitters, or vehicle electronicsystem to establish the presence of an intruder. Examples of this arethe airbag sensor used to determine the occupant's size and weight orthe sensor used to level the vehicle's suspension or the sensor thatdetects the presence of an occupant for the seat belt fastener. Itshould be apparent that a motion sensing system will generally be moreuseful for larger children (or in an alternative embodiment for pets)where they may not be confined to a car seat.

In a still further embodiment, one would recognize that the system (200)can be operated effectively in reverse to provide an alternativeprotection system (200). If the parent is concerned about a childpossibly undoing a seatbelt or getting out of the seat while the vehicleis moving, an alarm (211) could also be triggered by the sensing of thechild (101) moving outside the seat area, or detection that the child isno longer in the seat (100). This alternative mode of operating cansimply provide for a different notification sound in the embodiments ofFIGS. 1 and 6 when the pressure switch (201) is released indicating thatthe child is no longer in the seat (possibly by having an alternativesensor that detects unlatching of the seatbelt). This detection mayoccur while also detecting that the vehicle is in motion or not. Thisembodiment and operational method may be particularly beneficial forslightly older children where the risk of them being left unattended isdecreased, but their increased independence could result in such adangerous situation with them not being properly restrained. In anembodiment, the system (200) may include the ability to switch betweenthese modes so as to provide for increased functionality or to operatein both modes simultaneously.

Child detection systems (201), such as those discussed above can be usedsingly, or in combination, depending on the embodiment, to arm thesystem (200). For example, a mass sensor may be used to detect thepresence of a small child in a carrycot or other hand carrying portionof a car seat (100). A volume detector may then be used to determine ifthe carrycot or hand carrying portion has been connected to a mountingsystem located in the vehicle which is designed to secure the child(101) in the vehicle without need of transferring the child (101)between carriers. Unless both systems indicate the presence of thechild, then the system (200) remains disarmed. In this way, a child(100) does not need to be removed from the seat to disarm the device asthe parents would normally remove a portion of the seat and the childinstead. Further, this type of arrangement also provides that the manualdisarm (209) of FIG. 6 may not be necessary on such a seat (100).

In the depiction of the FIGS, there is also provided a reminder ornotification (211). The reminder system (211) is generally an audiblesystem which is designed to produce an audible reminder that there is achild in the vehicle. However, the alarm (211) may comprise audible,tactile, visual, electronic, or any other stimulant reminder that thechild is present in the vehicle. The reminder system (211), depending onembodiment, can comprise a subtle but specific reminder of the presenceof the child all the way to a shrieking alarm system designed to attractthe attention of passers-by to examine the vehicle and possibly rescue achild which has been inadvertently left in the vehicle. The system canalso include multiple different alarms, such as to provide for anescalating alarm system. In one such embodiment, the system may providea subtle reminder for a period of time purely within the cabin of thevehicle. If the child (101) has not been removed within this period oftime, the system (200) may escalate to a longer ranged alarm such ascalling a parent's cellular phone. In the event that the child (101) hasstill not been removed, the system (200) may initiate an alarm designedto alert passers-by to locate the vehicle's owner or determine if anunattended child is in the vehicle. In an embodiment this could comprisetriggering the vehicle's anti-theft system, for example, or couldprovide for external speakers.

The alarm system (211) may be self contained and external to thevehicle's electronics communicating via wire or wireless methods withthe remaining components of the system (200), may be integrated with thevehicle's existing electronics (e.g. so as to allow the vehicle's hornto sound upon an alarm condition), or may interface with other objectsthe parent may have, such as a cellular phone, pager, or other wirelessdevice that they are likely to have with them.

The system (200) could communicate via wireless communication and orhard wire to the alarm (211) based somewhat on the design and the typeof alarm system (211) that is to be activated. In the depictedembodiment of the FIGS the alarm (211) comprises a subtle remindersystem.

In this case, there is generally little to no delay on the vehicleoperation sensing system (221) and therefore the system (200) willgenerally trigger as soon as no vehicle acceleration is detected. In thedepiction of the FIGS, the alarm (211) comprises a speaker andassociated electronics with a memory of classic children's songs (suchas lullabies). Upon detection that the system (200) is armed and thevehicle is not accelerating, the alarm (211) will play a brief excerpt(from between 15 and 30 seconds in an embodiment) of a song. Thisreminder will be transmitted via an attached speaker and will generallyonly be audible to a vehicle's occupants or those nearby if a door orwindow on the vehicle was open. This type of alarm (211) is designed tobe subtle and non-intrusive while still serving as a reminder of thepresence of the child (101). The reminder is particularly useful becausesince it is non-obtrusive it can sound repeatedly without being anannoyance. For example, the system (200) will generally sound each timethe vehicle comes to a stop, such as at a stop light to remind theparent that the child (101) is in the vehicle. The system (200) willalso sound when the vehicle is parked serving as another reminder toremove the child (101). Once the notification has sounded, it may entera wait mode where it will not notify for a longer period of time. If nomovement has been detected, it may sound again. In this way the systemdoes not become annoying if the vehicle is stopped at a stoplight, whilestill making sure that notification is given.

As also depicted in the FIGS, the third major component of the system isa system for detecting whether the vehicle is in operation (221). Thissystem (221) effectively serves to inhibit the notification (211) fromsounding while the vehicle is in operation, while at the same time notturning off or disarming the system (200). In this way the alarm (211)is effectively disabled from sounding when it is undesirable for it tosound. The presence of a child in a car seat (100) within a vehiclewhich is in operation is generally not an issue as the parents are alsopresent and the child (101) is not unattended.

There are a number of ways to determine if a vehicle is in operation.One is to detect that the engine is operating. This however, is notnecessarily ideal because it is possible for a child (101) to be left ina vehicle which is running, but parked, resulting in the child (101)still being unattended. Instead, a more powerful determination system isto determine if the vehicle is in motion. If the vehicle is moving, inthe vast majority of situations, it will be doing so at the command ofthe driver who will also be present in the vehicle. If the vehicle isstopped, there may or may not be a caretaker present in the vehicle andtherefore the commencement of possible alarm situations is desired.

To detect that the vehicle is not in operation, the embodiment of thesystem (200) depicted in the FIGS includes a motion sensor (221) whichis used to establish if the vehicle is moving or not. Specifically, inthe depicted embodiment, the motion sensor comprises an accelerometer(221) which is designed to detect the acceleration of a vehicle whichmay be in any dimension and any number of dimensions. However, one ofordinary skill in the art would understand that other types of motionsensors could be included such as, but not limited to, remotepositioning systems (such as GPS), inertial systems such as gyroscopes,infra red, capacitive, or acoustic sensors. Still further systemsdesigned to detect the vehicle's operation, but not necessarily motioncould be used such as wireless transceivers for detecting a vehicle'swireless signals or a transceiver tied into the vehicle's electricalsystem or the other sensors used to establish speed or engine functionor to monitor battery voltage for fluctuations that occur duringstarting and or stopping the vehicle. Still further, acoustic orvibration sensors could be used to detect engine or vehicle noise orvibration indicative of a running or moving vehicle.

The accelerometer (221) can be a beneficial system because it willtrigger the alarm (211) whenever the vehicle comes to a halt, or isotherwise not accelerating Further, the accelerometer (221) is simple,robust, and while sensitive to the stopping of the vehicle, and willgenerally not trigger an alarm situation while the vehicle is in motioneven if the motion is erratic or very slow. Even under the command ofcruise control or other computer aided piloting programs, a vehicle'sspeed is rarely perfectly constant when it is in motion, but insteadthere are slight fluctuations in the speed over time. These smallaccelerations will generally result in the alarm system (211) not beingactivated while the vehicle is in motion. At the same time, a vehicle atrest will rarely incur any acceleration and the alarm (211) is thereforereliably activated. It should also be noted that in an alternativeembodiment, the accelerometer (221) and or control (231) can be furtherrefined to recognize acceleration more specific to a vehicle being inmotion. For example, it may detect acceleration along a particular axis,or in accordance with a particular rate or curve.

The control (231) is generally a processor or similar device whichserves to control operation of the various components. It may, in anembodiment, include a delay to determine if an alarm (211) should soundbased on activation by the accelerometer (221). While in one embodimentas discussed above the alarm (211) is designed to sound after only a fewseconds without acceleration being detected, if the alarm (211) wasdesigned to be more obtrusive this is undesirable. The delay chosenwill, therefore, generally depend on the nature of the alarm (211) thatis present. In the event the alarm (211) is a subtle reminder type ofalarm (211), the control (231) may include no or little delay. In thisway, whenever the vehicle comes to a complete stop, the driver isreminded of the presence of the child. In effect, the system (200)provides a much more constant reminder. If the alarm (211) is moreintrusive, the delay may be for a longer period of time. In this way,the alarm (211) is not generally triggered at a stop light or otherstopping situation where the vehicle is stopped, but not parked, butwill trigger if the vehicle is parked and remains so for a reasonableperiod of time. In another embodiment, the control may include memoryfor storage of alarm conditions, operational or test software, or otherexecutable instructions for the processor.

So as to illustrate alternative operations of the system, two differentexemplary operations will be described.

In the first system the device (200) is designed to utilize two motiondetectors (221) in conjunction with each other. The first motiondetector (an accelerometer in this embodiment) determines if the vehicleis not in operation and if so arms the system, the second motiondetector (201) is used to determine if there is motion within thevehicle (indicating the presence of an unattended child (101)) andtrigger the notification (211).

In an operation of the system (200) in this example, an embodiment of anaccelerometer (221) may work as follows. If the accelerometer (221)output changes by more than 0.1 g or 60 millivolts in any 200millisecond period and outputs acceleration in the same direction foreach of the 67 millisecond periods during this 200 millisecond period,it can be determined that the vehicle is moving. A determination ofmovement results in a timer in the control (which may be on the order of120 seconds) is reset to zero seconds. If the timer reaches 120 secondsand the vehicle is determined to not be moving at that time (and/or hasnot moved during that time) the second motion sensor (201) is activatedand monitored. At this point it is assumed that the vehicle is probablyno longer in operation so the system needs to determine if a child (101)is present in the vehicle. This embodiment therefore does not arm thesystem (200) from the child's (101) presence, but instead arms thesystem (200) from the vehicle being determined to not be in operation.

The logic over the 200-millisecond period on the accelerometer (211) canbe to differentiate between a child (101) moving in a seat (100) whichmay provide some acceleration to the seat (100), which may be picked upby the accelerometer (221), and the vehicle moving, which is also pickedup by the accelerometer (221).

Movements by a child (101) (or other human interacting with the carseat) generally generate short acceleration spikes typically less than67 milliseconds in duration, These spikes randomly accelerate anddecelerate within the 67-millisecond period. In effect, the accelerationis “jerky.” A vehicle that is moving on the other hand typicallyexhibits a gradual increase in acceleration (in the same direction withlittle or no deceleration present) for periods longer than 200milliseconds. The control system in this embodiment, is constantlylooking for these cases to establish if the car is sitting still and isdisregarding other possible acceleration such as a child (101) moving inthe seat (100) or the seat (100) being moved by something other thanvehicle motion. It should be understood that through filtering insoftware or hardware the control (231) could filter out the child (101)moving and the same motion detector (221) may be used for both purposesin some embodiments.

The choice of delay in this case is to allow time to turn the vehicleoff and remove the keys, gather belongings, remove the child, and exitthe vehicle (which has been found to be approximately 120 seconds). Inthe currently discussed embodiment, if no vehicle motion that isconsistent with a properly started, running, or rolling vehicle isdetected from the accelerometer (221) for 120 seconds a second motiondetector is enabled to detect the presence of a child (101) in thevehicle. When the control (231), which in this case is a microprocessor,senses a change in the output of this second motion sensor, it enablesand starts another 120-second timer that counts the number of changesthat occur in the next 120 seconds. If the microprocessor (231) senses apreselected number of changes during this window or if the initial pulseis continuously low for the period, the control determines that anunattended child (101) situation may exist and an alarm signal istransmitted to the alarm system (211), sounding an alarm.

If a child (101) were left in an unattended vehicle that does not havethe ignition on, the alarm would therefore generally activate 240seconds after the vehicle was parked. If a child (101) entered anunattended vehicle and was detected by the motion sensor (221) or thecar seat detector (201) without having the ignition on, the vehicle'salarm (211) would sound within around 120 seconds. If the vehicle issitting still (parked) while the engine is running the alarm (211) willstill enable itself after 120 seconds and after an additional 120seconds with child (101) continuously present in the vehicle, it willalso trigger the alarm (211).

In the case of the alarm sounding it may be able to be deactivated(effectively resetting the timers) via a remote device or deviceconnected to the system to prevent an annoyance alarm.

In a second exemplary embodiment, the device of FIG. 1 is used andcomprises a weight sensor (201) to detect the child in conjunction withan accelerometer (221) to detect vehicle motion. In this case, theweight sensor (201) serves to arm the system (200). If there is notdetected to be sufficient weight in the seat (100) to activate thesystem (200), the system (200) remains in a disarmed state and the alarm(211) will not trigger. Once the system (200) is armed, the controlsystem (231) will activate and monitor the output of the accelerometer(221), So long as vehicle acceleration is detected as discussed above,the control (231) will not trigger an alarm (211). As soon as vehicleacceleration is not detected, a short timer (for example 5 seconds) isbegun. In this way, false alarms such as if the vehicle is cruising at arelatively static speed are prevented. If the vehicle has not moved inthe short delay period, the alarm (211) is sounded by the control (231).In this case, playing a children's song via the speaker internal to thepassenger compartment of the vehicle. Once a short song has played, thesystem (200) control (231) will go into a hold mode and a longer delay(for instance 30 seconds) will be allowed to pass to determine if thevehicle motion has resumed. If it has not, the notification (211) may besounded by the control (231) again. If motion is detected in the holdperiod, the system (200) will generally reset. A number of such holdperiods may be used sequentially providing reminders to a parent as theyare leaving their vehicle.

Further in this embodiment, when the child moves off of the sensor(201), the control system (231) will also detect that the system (200)is to disarm and will also trigger a notification (211) to identify thatthe system (200) is disarming. In this embodiment, the notification(211) plays a series of beeps or chirps to indicate that the system(200) is disarming. If the parent has purposefully removed the child(101) from the seat (100), this notifies them that the system (200) hasdisarmed and will not annoy them. If the child (101) is expected tostill be in the seat this provides an immediate warning to the parentthat they may need to stop the vehicle and check on the child (101).

While not depicted in the FIGS, in the event that a predetermined numberof alarms have sounded indicative that the child (101) may not have beenmoved (for example 300 seconds has elapsed since the initial alarm) andthe parent may no longer be present, the control (231) may escalate thealarm. In an embodiment, this comprises activating a wirelesstransmitter that contacts a parent's cell phone or a device such as aBluetooth™ receiver provided with the system and which the parent issupposed to have with them at all times. The system (200) may then waitfor a response. If the parent knows this to be a false alarm, they mayindicate on their wireless device resetting or disarming the system(200). If the system (200) does not receive a response from the parent,the system (200) may escalate further and possibly sound an externalalarm on the vehicle trying to attract the attention of passers-by toget them to break into the vehicle and rescue the child (101).

It should be noted that one advantage of using an accelerometer (221)sensitive to vehicle motion to reset a system (200) with an escalatingor other external alarm is that it allows a vehicle occupant to easilyreset a false alarm. For example, should the parent be stuck in trafficand the alarm be escalating or sounding, they can easily reset thetimers by simply allowing the vehicle to roll forward a short distance,which motion is detected and the system and results in a reset. Further,even in heavy traffic it is unlikely that the vehicle will not be movingat all naturally inhibiting alarm escalation.

While the invention has been disclosed in connection with certainpreferred embodiments, this should not be taken as a limitation to allof the provided details. Modifications and variations of the describedembodiments may be made without departing from the spirit and scope ofthe invention, and other embodiments should be understood to beencompassed in the present disclosure as would be understood by those ofordinary skill in the art.

1. A device for providing notice that a child is in a child safety seatin a vehicle comprising: a pressure sensor; an accelerometer; anotification system; and a controller; wherein if said pressure sensordetects pressure in said child safety seat and said accelerometer doesnot detect acceleration indicative of a physical displacement of saidvehicle, said controller activates said notification system; whereinonce said notification system is activated, said controller waits apreselected amount of time and if after said time has passed, saidpressure sensor detects pressure in said child safety seat and saidaccelerometer does not detect acceleration indicative of a physicaldisplacement of said vehicle, said controller activates saidnotification system a second time and with a different notification; andwherein once said notification system is activated said second time saidcontroller again waits a preselected amount of time and if after saidtime has passed, said pressure sensor detects pressure in said childsafety seat and said accelerometer does not detect accelerationindicative of a physical displacement of said vehicle, said controlleractivates said notification system a third time and with a differentnotification.
 2. The device of claim 1 further comprising a temporarydisarming switch.
 3. The device of claim 1 wherein said pressure sensoris placed in a child seat.
 4. The device of claim 3 wherein said childseat is forward facing.
 5. The device of claim 3 wherein said child seatis rearward facing.
 6. The device of claim 3 wherein said child seat isa booster seat.
 7. The device of claim 1 wherein said notificationsystem plays sound when activated.
 8. The device of claim 7 wherein saidsound comprises a children's song.
 9. The device of claim 1 wherein saidnotification system is also activated when said pressure sensor goesfrom detecting pressure to not detecting pressure.
 10. The device ofclaim 1 wherein there is a delay after said accelerometer does notdetect movement before said notification system is activated.
 11. Thedevice of claim 10 wherein said delay is about 15 seconds.
 12. Thedevice of claim 1 wherein when said notification system activates saidsecond time or said third time it contacts a remote device.
 13. Thedevice of claim 12 wherein said remote device comprises a cell phone.14. The device of claim 1 wherein said accelerometer comprises a 3-axisaccelerometer.
 15. The device of claim 14 wherein said controller candistinguish acceleration indicative of a physical displacement of saidvehicle from acceleration indicative of vibration of said child safetyseat within said vehicle.
 16. The system of claim 1 wherein saidnotification system sends a message to a remote device.
 17. The systemof claim 16 wherein said remote device comprises a cell phone.
 18. Amethod for assisting in the detection of a child in a parked motorvehicle, the method comprising: detecting whether or not a child is in avehicle; determining whether or not said vehicle is parked, wherein ifsaid vehicle is not found to be repeatedly accelerating along a fixedaxis, said vehicle is determined to be parked; and if said child is insaid vehicle and said vehicle is parked, generating a notificationsignal to indicate the presence of said child.
 19. A device forproviding notice that a child is in a child safety seat in a vehiclecomprising: a pressure sensor; an accelerometer; a notification system;and a controller; wherein if said pressure sensor detects pressure insaid child safety seat and said accelerometer does not detectacceleration indicative of a physical displacement of said vehicle, saidcontroller activates said notification system; and wherein if saidaccelerometer indicates acceleration in the same direction for each ofthree subperiods within a period, said controller determines saidvehicle is physically displaced in said period.
 20. The device of claim19 wherein said period comprises about 200 milliseconds.
 21. The systemof claim 19 wherein said motion detecting system is built into saidvehicle.
 22. The system of claim 19 wherein said motion detecting systemis built into said child safety seat.
 23. The device of claim 22 whereinsaid child seat is forward facing.
 24. The device of claim 22 whereinsaid child seat is rearward facing.
 25. The device of claim 22 whereinsaid child seat is a booster seat.
 26. The system of claim 19 whereinsaid notification system sends a message to a remote device.
 27. Thesystem of claim 26 wherein said remote device comprises a cell phone.